<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div{
            width: 100px;
            height: 100px;
            background-color: #f00;
            position: absolute;
        }
    </style>
</head>
<body>

    <button>11111</button>
    <div></div>

    <script src="../js/jq.js"></script>

    <script>

        $('button').on('click' , function() {
            $(this).next().stop()
            $(this).next().animate({
                'width' : '300px' ,
                'height' : '300px' ,
                'left' : 900 ,
                'top' : 300
            } , () => {
                console.log('end');
            })
        })

    </script>
    
</body>
</html>